Roll tension device



Jan. 11, 1949. 5, HELLAND 2,458,852

ROLL TENSION DEVICE Filed May 51, 1946 2 Sheets-Sheet 1 INVENTOR.

ATTY

Jan. 11, 1949. s. H. HELLAND ROLL TENSION DEVICE 2 Sheets$heet 2 FiledMay 51, 1946 Patented Jan. 11, 1949 ROLL TENSION DEVICE Sigurd H.Holland. Whitinsviiie, Mass., assignor to Whitin Machine Works,Whitinsvil a corporation of Massachusetts e, Mass.,

Application May 31, 1946, Serial No. 673,558

3 Claims.

. 1 This invention relates to combers and other similar machines inwhich textile fibers are drafted between tensioned drawing rolls.

It is the general object of my present invention to provide improvementsin the devices for applying spring tension to the pairs of drawingrolls, and to provide an improved construction for relieving suchtension when desired.

To the accomplishment of these objects, I provide improved means forseparately supporting and guiding the springs which apply tension toeach top drawing roll. and I also provide improved means for applying alifting and pressurerelieving force to the collective tension devices ofa set of drawing rolls.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of the invention in the drawings in which Fig. 1 is asectional side elevation of a set of drawing rolls having myimprovements applied thereto;

Fig. 2 is a. detail sectional end elevation, taken along the line 2-4 inFig. 1;

Fig. 3 is a sectional front elevation, the line 3-3 in Fig. 1; and

Fig. 4 is a partial sectional view,

is shown taken along similar to Fig. 3 but showing the parts in adifferent operative relation.

Referring to the drawings, I have shown parts of a commercial combercomprising a frame Ill on which a box-like casing I I is secured bybolts l2. Side rails I 4 are mounted on the casing l2 and are securedthereto by bolts IS. The upper surfaces 'of the rails l4 are groovedlongitudinally as shown at IS in Fig. 3 to receive and guide the bearingboxes in which the bottom rolls B are rotatably mounted and in which thebearings 22 for the top rolls R are vertically adjustable. The rails l4are longitudinally slotted to receive bolts 24 by which the bearingboxes 20 are held in desired spaced relation along the rails l4.

A cross bar is provided for each pair of drawing rolls and is providedwith end openings 3! (Fig. 3) to receive the bolts 24 which thus act toclamp both a bearing box 20 and an associated cross bar 30 to a siderail I4. Correct relative alignment of these parts is thus maintained.

Tension is applied to each top roll R by springs S acting through rodsand links 4|. Each rod 40 extends downward loosely through a guidesleeve44, and receives the downward spring pressure againsta washer and collar46, the

2 spring tension devices being of the usual construction. At its upperend, each sleeve 44 engages a cross bar 30, and each rod 40 extendsthrough a longitudinal slot 48 in said cross bar. A cross arm 50.15mounted above each cross bar 30 and is slotted at its ends to receivethe spring-tensioned rods 40. Washers 5% on the rods 40 engage theupperend surfaces of the cross bar. 50. A stud 54 is fixed at the middleof each cross arm 50 and extends freely downward through a,guide-opening in a lug 55 formed on the under side of the associatedcross-bar 30.

The studs 54 for a full set of drawing rolls all engage the upper sideof a shelf which is pivoted at 5| to the ends of the casing II. A camshaft (Fig. 1) is mounted in bearings'in the casing I! and is providedwith eccentrics 66 which engage the under side of the shelf 60. A handleIll at one end of the cam shaft 65 provides for convenient manualoperation thereof.

By shifting the eccentrics 66 from the inoperative position shown inFig. 3 to the operative position shown in Fig. 4, the spring tension onall of the top rolls R of a set of drawing rolls may be simultaneouslyrelieved, which is desirable when top rolls having cushioned surfacesare to be inoperative for a considerable period.

The provision of a cross bar 30 and cross arm 50 for each pair ofdrawing rolls, and the provision of means for holding these parts inaccurate alignment with the corresponding roll bearing boxes permitconvenient transverse adjustment of the drawing rolls to meet draftingconditions, while at the same time the associated tension devices aremaintained in accurate alignment.

The provision of the swinging shelf between the eccentrics 66 and thestuds 54 permits application of a more directly vertical relievingpressure to the studs 54, so that any tendency to bind is avoided.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

1. In a drawing mechanism having pairs of drawing rolls, bearing boxesfor said rolls and side rails along which said boxes are adjustable, incombination, a cross bar for each pair of draw- ,ing rolls, a boltextending through each end of eachcross bar and through the adjacentside rail and into the adjacent bearing box and clamping said threeparts together, with said cross bar and said bearing box in permanentassembled alignment, and spring tensioning means for each pair 55 ofrolls positioned and guided y the associated erable to relieve thespring tension on the asso- 10 ciated top roll, a guiding stud in saidcross arm slidable in said cross bar, and means to engage said stud andlift said cross arm to relieve the spring tension.

3. The combination in a drawing mechanism as set forth in claim 2, andin which the lifting means comprises a sheli pivoted to swing about alaterally oflset horizontal axis and engaging the lower ends of aplurality of said studs, and cam means to raise said shelf.

SIGURD H. HELLAND.

REFERENCES CITED The following references are or record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,177,929 mmbert Oct. 31, 19392,307,670 Cunningham Jan. 5, 1943 15 2,412,357 Robinson Dec. 10, 1946

